Add checkTestSources extension point for Lint.

[vanniktech]

No description provided.

[codecov]

Codecov Report

Merging #144 into master will increase coverage by 1.58%.
The diff coverage is 93.33%.

@@             Coverage Diff              @@
##             master     #144      +/-   ##
============================================
+ Coverage     69.11%   70.69%   +1.58%     
- Complexity       81       94      +13     
============================================
  Files             4        5       +1     
  Lines           259      273      +14     
  Branches         39       40       +1     
============================================
+ Hits            179      193      +14     
  Misses           68       68              
  Partials         12       12

Impacted Files	Coverage Δ	Complexity Δ
...ality/tools/CodeQualityToolsPluginExtension.groovy	100% <ø> (ø)	0 <0> (ø)	⬇️
...com/vanniktech/code/quality/tools/LintExtension.kt	100% <100%> (ø)	12 <12> (?)
...h/code/quality/tools/CodeQualityToolsPlugin.groovy	75.54% <66.66%> (+0.21%)	81 <0> (+1)	⬆️

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